Three Rivers is an unincorporated community in Tulare County, California, United States. Located in the foothills of the Sierra Nevada at the edge of the San Joaquin Valley, the town is near the entrance to the national parks of Sequoia and Kings Canyon. The town's name comes from its location near the junction of the North, Middle, and South Forks of the Kawea…Three Rivers is an unincorporated community in Tulare County, California, United States. Located in the foothills of the Sierra Nevada at the edge of the San Joaquin Valley, the town is near the entrance to the national parks of Sequoia and Kings Canyon. The town's name comes from its location near the junction of the North, Middle, and South Forks of the Kaweah River.